Quote:
Originally Posted by Xenakios
The FFT analysis results can of course be displayed with any desired scaling of the data. But are you sure what that iPhone app is doing is actually doing the FFT analysis any differently than is usual? (The usual being, with way too much frequency resolution in the highest octaves than is wanted and poor resolution in the bass octaves...)
There are of course various alternative ways of doing the spectral analysis, with and without using FFT.
|
The result when selecting equal points per octave is exactly that. How it achieves it, I don't know.
They added that option to specifically increase the resolution as the frequency decreases. The trade-off is that the lower bands respond slower than the higher bands but it is perfectly usable in realtime even on such ancient (by modern standards) hardware.
That app was actually quite expensive and was designed by audio professionals to be used in serious applications. I ran it with hardware preamps and calibrated microphones and it was (still is) very accurate and useful.